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David
Dr David Castelow
Airspan Communications Ltd
Principal Systems
Engineer Cambridge House, Oxford Road
DSP & Systems Design
Uxbridge UB8 1UN, UK
http://www.airspan.com
+44 1895 467281
Dear all,
Based on
discussion for AMC permutation and DL PUSC permutation these days, I'd like to
speak out my doubts about the definition of subchannel in .16d/.16e
Spec. here. Hope to get your opinion about this issue. Thanks~
I just want to confirm the
Definition of Subchannel in spec.
It is a 1
dimension allocation unit or 2 dimension allocation unit on earth? or
it depends on different case?
For example: "Tile" in UL PUSC is a block with size of 4 subcarrier
x 3 symbol, so we can regard it as a 2 dimension allocation unit. And
totally there are 4*3=12 subcarrier per Tile in UL PUSC case. Actually
"12" is some kind of logical number because only 4 physical subcarriers
are allocated here. And also for subchannel in this case (6 Tiles make
1 subchannel), we say 48 data subcarriers per subchannel, which is also a
kind of logical number, right?
But in DL FUSC case, seems subchannel is a 1
dimension allocation unit, because it has 48 physical subcarriers per subchannel
(without consideration of time domain).
So totally, we can conclude the definition of
subchannel of all cases as below:
DL FUSC/OFUSC: 1 dim. allocation unit with 48 subcarriers
per subchannel
DL
PUSC: 1 dim. concept if say 24 subcarriers or 2 dim. concept if say 48
subcarrier per subchannel
UL PUSC/OPUSC: 2 dim. allocation unit with totally 48 subcarriers per
subchannel
AMC: 2
dim. allocation unit with 48 subcarriers per subchannel
I was perplexed by this problem for a long
time, really hope you can help me to make this clear.
Thanks a lot in advance!
Hongmei SUN